another update; a lot of changes
another update, mainly created plot_types/grped_bars.py
improved distr.py; added grped_distr.py, which can also do grped_distr_ave type of plots.
added xy.py, but only data grouping for two properties are done, plotting is not dealt with yet
start ploting xy, but no decoration yet
finished xy
separated plot_type and plot2p_type using decorator
now start working on grped_xy
do normalization in calcit rather than elsewhere
distinguish TRANSFORMABLE_METHODS and METHODS when use -h
changed argument name plot2p_type to plot_type in plot2p_types/xy.py
now, upv and unv kind of transformation is enabled
updated mysys.dat